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I tried the Superchips Cortex and had many issues.
I ended up with a SCTx3 from Mike @ 5 Star, the Eco tow tune works out best for me.
look around for a laptop computer tuner in your area. I have a five star tuned SCT on my 5.4 and it didnt do much of anything really. Im in the process of trying to sell it and after the new year im having a laptop tune put on my truck!
I have seen a lot of posts praising the five star on the v10, but folks with the 5.4 seem unimpressed for the most part. I looked into this in a lot of detail for my own 5.4, and I cannot find anything that folks are really happy with...lots of complaints about wasted money.
yea me and a few others have the 03-04 5.4 in our super duties and we all hare unimpressed with the SCT on the 5.4. I dont know if its because the 2valve 5.4 doesnt benefit from the tunes or what but i hate that i spent the money on it and its no different then stock! I have a Sonnex shift kit so my trans shifts like an animal with or without the tunes..........